The Frenchman was carried off on a stretcher after suffering a 'deep laceration to the knee' and the early prognosis suggests that Arsenal could be without one of their most influential players as they enter the hectic Christmas period.

Koscielny was involved in a collision with Alvaro Negredo as the two players slid in, with the Spaniard diverting the ball into the goal to hand City a 2-1 lead in the 38th minute.